Imitation diamond.



oppositely JAMES C. MCDEARMON, OF HOUSTON, TEXAS.

IMITATION DIAMOND Specification of Letters Patent.

Patented May 19, 1908.

Application filed August 6, 1907. Serial No. 387,380.

To all whom it may concern.'

Be it known that I, J AMEs O. MCDEARMON, a citizen of the United States,residing at Houston, in the county of Harris and State of Texas, haveinvented certain new and useful Improvements in Imitation Diamonds, ofwhich the following is a specification.

This invention relates to imitation gems g and it has for its object toproduce an imitation diamond which may be utilized for a variety ofornamental purposes which shall be sparkling and lustrous, and which maybe manufactured at a moderate expense.

I/Vith` these and other ends in view which will readily appear as thenature of the invention is better understood, the same consists in theimproved manufacture of the said imitation diamond which will behereinafter fully described and particularly pointed out in the appendedclaims reference being had to the accompanying drawing, in which:

Figure 1 is a front view of an imitation diamond constructed inaccordance with the invention. Fig. 2 is a rear view of theusame. Fig. 3is a transverse sectional view.

Corresponding parts in the several figures are designated by likecharacters of reference.

The body of the improved imitation diamond is formed of aconvexe-concave disk 1 of glass or crystal; any suitable clear colorlessor colored glass, free from flaws, being preferably utilized. The diskis preferably of equal thickness throughout, and its outer or convexface is cut, by the ordinary process of glass cutting, to present aplurality of facets 2, 2, the disk being eut in imitation of any of thewell known forms of diamond eutting. The rear side or face of the disk,that is to say, the concave side thereof is likewise formed withaplurality of facets 3, 3, the latter facets being either formed bycutting, or by pressing or molding in the process of manufacturing thedisk; it being however observed that the facets 2, 2 and 3, 3 onopposite sides of the disk are formed in register with each other; eachindividual facet upon the face of the disk will thus have a counterpartupon the rear side of the disk, and the disposed or registering facetsor faces upon the two sides of the disk will be substantially parallel.

The disk having been prepared, in the manner described, there is appliedto the rear or concave face of the disk a reflecting coating 4,preferably a metallic composition or amalgam as is used in themanufacture of mirrors, each individual facet upon the front convex sideof the disk will thus be enabled to reflect rays of light with greatbrilliancy.

For the purpose of protecting the reflective coating and also for thepurpose of reinforcing the disk, the concave side of the latter may beprovided with a `filling of plastic material, as shown at 5, in Fig. 3of the drawings, this, however, may be used or omitted in the discretionof the manufacturer.

From the foregoing descri tion, taken in connection with the drawingsiereto annexed, the operation and advantages of this invention will bereadily understood. An imitation gem of great brilliancy may be producedat a very moderate expense 5 and it is obvious that there is practicallyno limit to the size of gem that may be produced under the invention.

I claim 1. An imitation diamond com prising a convexe-concave disk oftransparent glass provided on opposite sides with facets disposed inapproximately parallel relation.

2. An imitation diamond comprising a convexe-concave disk of transparentglass )rovided on opposite sides with registering facets disposed inparallel relation` 3. An imitation diamond comprising a convexo-concavedisk of transparent glass provided on opposite sides with registeringfacets disposed in parallel relation; and a refleeting coating upon theconcave side of the disk.

4. An imitation diamond comprising a disk of transparent glass providedon opposite sides thereof with registering facets disposed in parallelrelation; a reflecting coating applied to the facets on one side of thedisk; and a prote'eting covering for said coatmg.

In testimony whereof I affix my signature, in presence of two witnesses.

JAMES C. MCDEARMON.

Iitnesses:

IN. H. SHELDON, J O. KIsI-IPAUGH.'

